Finding the Fourth Proportional to 2,275.78, 3,140.52 and 1,281.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.78 : 3,140.52 = 1,281.02 : x
2. Step 2: Convert to fraction form
   2,275.78/3,140.52 = 1,281.02/x
3. Step 3: Cross multiply
   2,275.78x = 3,140.52 × 1,281.02
4. Step 4: Simplify right side
   2,275.78x = 4,023,068.93
5. Step 5: Solve for x
   x = 4,023,068.93/2,275.78
6. Step 6: Final answer
   x = 1,767.78